6000 ans, les AA. ont privilégié 3 types de marqueurs susceptibles d'aider à positionner les lignes de rivage holocènes fossiles : les marqueurs géomorphologiques (encoche, beachrock, trottoir), les constructions organogènes de vermets et les marqueurs
Dating ; Forest ; Isotope analysis ; Research technique ; Sedimentation ; Sedimentology ; Soil erosion ; Steppe ; Watershed
Les AA. proposent d'utiliser le césium-137 (qui arrive dans l'atmosphère du fait des expériences nucléaires) comme un marqueur pour dater les sédiments récents à l'intérieur des divers éléments d'un système d'érosion (du versant à la vallée fluviale
Alluvial plain ; Archaeology ; C 14 dating ; Central Tunisia ; Chronostratigraphy ; Holocene ; Palaeo-environment ; Palaeosol ; Pedogenesis ; Quaternary ; Sedimentology ; Tunisia
d'activité morphogénique et de pédogenèse sont une conséquence de l'action des fluctuations climatiques holocènes combinées avec celles des activités humaines. En se basant sur des datations radiocarbone et des marqueurs archéologiques, l'A. présente une
Alluvium ; C 14 dating ; Chronostratigraphy ; Dating ; Fluvio-aeolian deposits ; France ; Lille ; Loess ; Nord-Pas-de-Calais ; Optically stimulated luminescence ; Palaeogeography ; Pleistocene ; Pleniglacial ; Quaternary ; Sedimentology
quelques marqueurs de froid. Elles cèdent la place à des formations fluvio-éoliennes, apparemment en continuité, qui, d'abord litées et argileuses, deviennent loessiques. Selon les résultats de datations C 14 et OSL, la formation limoneuse à dominante
éolienne des dépôts et de la quantifier. Distinction de 6 stocks éoliens traduisant des dynamiques variées et constituant 3 types de marqueurs paléoclimatiques de l'aridité.
Biostratigraphy ; Chronostratigraphy ; France ; Heavy minerals ; K/Ar dating ; Massif Central ; Palaeogeography ; Pleistocene ; Pliocene ; Quaternary ; Sedimentology ; Volcanism
et 0,8 Ma. Dans le bassin du Puy, elles ont abouti à la mise en place d'une séquence sédimentaire fluvio-lacustre de 150 m d'épaisseur qui représente un enregistrement de référence pour la connaissance du Pléistocène inférieur européen. Aux marqueurs
Allier ; Alluvial nappe ; Fluvial processes ; France ; Heavy minerals ; Massif Central ; Pleistocene ; Quaternary ; Sedimentology ; Stratigraphic correlation ; Tephrochronology ; Volcanism
Le système de terrasses quaternaire postérieur à 2 Ma comporte 12 unités principales et de nombreuses unités secondaires à développement plus ou moins local. L'étude des cortèges de minéraux lourds volcaniques et des marqueurs plus ponctuels
Sedimentology of a fine-grained aggrading floodplain
Floodplain ; Fluvial processes ; Land use ; Sedimentology ; Statistics ; United States ; Wisconsin
The present study characterizes the entire spatial variation in sedimentological properties along a portion of the presently aggrading floodplain of the Galena River in southwest Wisconsin. Another theme of this study is the detailed
sedimentological characteristics of the overbank facies.
Morphology and sedimentology of deltas in fjord and fjord valley lakes in Sedimentology of fjords.
Sediment supply, depositional processus and the associated morphology and sedimentology of deltas in a fjord and several fjord lakes have been studied. The morphology of the deltas have been investigated by echo-sounding. Differences in downstream
sedimentation rates of the various deltas are related to dynamic and geometrical properties of the systems. The effect of different factors on delta morphology and sedimentology is discussed.
New isotopic and sedimentological measurements of the Thabaseek deposits (South Africa) and the dating of the Taung hominid
Archeological site ; Cape Province ; Dating ; Geochemistry ; Isotope dating ; Quaternary ; Sedimentology ; South Africa ; Stratigraphy
This paper synthesizes the interpretations of the new stratigraphic, faunal, sedimentological, and radiometric data and offers a considered statement on the age of the Taung australopithecine skull.
This work focuses on the transport processes, sedimentology and clast fabric of slope deposits cropping out in active depositional environments, widespread between 900 and 1000 m in altitude, close to Mormanno, in Northen Calabria. - (NF)
This study provides a clearer understanding of hydrological and sedimentological processes and mechanisms operating during jökulhlaups (glacial outburst floods), and helps to identify flood hazards more accurately, which is fundamental for hazard
Alluvial cone ; Arid area ; Canada ; Gelifluction ; Periglacial features ; Permafrost ; Sedimentology ; Snow
The objectives of this study are to describe the morphology and sedimentology of an alluvial fan, the Mount Goodenough North fan, in a permafrost region; and to interpret the processes responsible for the development of the fan, using both direct
observations and inferences from fan morphology and sedimentology.
Glacigenic properties of till. Studies in glacial sedimentology from the Allgäu Alps and The Netherlands.
The intention of this study is to give a contribution to the knowledge of sedimentological properties of glacial diamictons, in particular those of subglacial origin. (AIS).
Differential bed sedimentology and the maintenance of riffle-pool sequences
Carrying capacity ; Devon ; England ; Fluvial processes ; Model ; River bed ; Sedimentology ; Statistics ; United Kingdom
The purpose of this paper is to clarify several aspects of the sedimentology of riffle-pool sequences, and to suggest how these both reflect and control riffle-pool stability in the presence of spatial differences in the turbulent near-bed flow
Desertification in the light of sedimentological features of dune deposits
Africa ; Asia ; Desertification ; Dune ; Eolian features ; Europe ; Grain size distribution;Granulometry ; Heavy minerals ; Micromorphology ; Sahara ; Sedimentology ; Southwest Asia ; Syria
The purpose of the present study was the answer to the question whether sedimentological features of dune deposits make a record of the duration of desertification processes. Particularly informative of the duration of aeolian processes